231505000 has 40 divisors (see below), whose sum is σ = 542427930. Its totient is φ = 92600000.

The previous prime is 231504947. The next prime is 231505003. The reversal of 231505000 is 505132.

It can be written as a sum of positive squares in 5 ways, for example, as 39204 + 231465796 = 198^2 + 15214^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (231505003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 18151 + ... + 28150.

Almost surely, 2^231505000 is an apocalyptic number.

231505000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231505000 is an abundant number, since it is smaller than the sum of its proper divisors (310922930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231505000 is an equidigital number, since it uses as much as digits as its factorization.

231505000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46327 (or 46308 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 231505000 is about 15215.2883640107. The cubic root of 231505000 is about 614.0260433803.

The spelling of 231505000 in words is "two hundred thirty-one million, five hundred five thousand".